"Like us on facebook" link on ebay listing?

Hello, is it allowed to post a "like us on fb" link on my ebay listing? I tried googling but can't seem to get a clear answer, a random seller is currently doing this and I'm sure it is a great way to get new fb likes and start a fan base, thanks

eBay says they don't allow external links, however if they were really against it, they wouldn't allow the code when you make listings? I've never had any issues with the millions of listings I've made.

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